XSPC offers this extremely
handy tool for your ATX power supplies. Simply plug in your 24-Pin
motherboard ATX lead from your power supply into this adapter and it will
trick your power supply into thinking a motherboard is attached, perfect for
power supply testing or for using your power supply outside of a case. Great
for testing lights, fans, hard drives or the power supply itself when you
don't have access to a motherboard, or simply don't need one.